Question

Assume that Na+ is being transported across a membrane via facilitated diffusion. Which of the following conditions would allow for the most transport of Na+ across that membrane?
Assume that Na+ is being transported across a membrane via facilitated diffusion. Which of the following conditions would allow for the most transport of Na+ across that membrane?
1. Na+ diffusing toward the side of the membrane with K+ and 5% less Na+
2. Na+ diffusing toward the side of the membrane with Cl− and 5% less Na+
3. Na+ diffusing toward the side of the membrane with K+ and 50% less Na+
4. Na+ diffusing toward the side of the membrane with Cl− and 50% less Na+

Answer 1

Answer:

4. Na+ diffusing toward the side of the membrane with Cl− and 50% less Na+.

Explanation:

Facilitated diffusion is a type of transport mechanism in which the special proteins are involved and play an important role in the transport of the atoms, ions or molecules. This mechanism is based on the electrochemical gradient differences. When this difference increase, then the transport of the sodium takes place because sodium ions are chemically attracted by chloride ions. In a facilitated diffusion process, no energy requirement takes place. This process occurs along the concentration gradient.